Omit origin when comparing requirements (#9570)

## Summary

I noticed that we consider two requirements to be different if they come
from different files. This seems like an oversight.

crates/uv-pypi-types/src/requirement.rs

@@ -36,9 +36,7 @@ pub enum RequirementError {
 ///
 /// The main change is using [`RequirementSource`] to represent all supported package sources over
 /// [`VersionOrUrl`], which collapses all URL sources into a single stringly type.
-#[derive(
-    Hash, Debug, Clone, Eq, PartialEq, Ord, PartialOrd, serde::Serialize, serde::Deserialize,
-)]
+#[derive(Debug, Clone, Ord, PartialOrd, serde::Serialize, serde::Deserialize)]
 pub struct Requirement {
     pub name: PackageName,
     #[serde(skip_serializing_if = "Vec::is_empty", default)]
@@ -97,6 +95,47 @@ impl Requirement {
     }
 }
 
+impl std::hash::Hash for Requirement {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        let Self {
+            name,
+            extras,
+            marker,
+            source,
+            origin: _,
+        } = self;
+        name.hash(state);
+        extras.hash(state);
+        marker.hash(state);
+        source.hash(state);
+    }
+}
+
+impl PartialEq for Requirement {
+    fn eq(&self, other: &Self) -> bool {
+        let Self {
+            name,
+            extras,
+            marker,
+            source,
+            origin: _,
+        } = self;
+        let Self {
+            name: other_name,
+            extras: other_extras,
+            marker: other_marker,
+            source: other_source,
+            origin: _,
+        } = other;
+        name == other_name
+            && extras == other_extras
+            && marker == other_marker
+            && source == other_source
+    }
+}
+
+impl Eq for Requirement {}
+
 impl From<Requirement> for uv_pep508::Requirement<VerbatimUrl> {
     /// Convert a [`Requirement`] to a [`uv_pep508::Requirement`].
     fn from(requirement: Requirement) -> Self {

crates/uv/tests/it/tool_install.rs

@@ -1974,7 +1974,7 @@ fn tool_install_requirements_txt_arguments() {
     ----- stdout -----
 
     ----- stderr -----
-    Installed 2 executables: black, blackd
+    `black` is already installed
     "###);
 
     let requirements_txt = context.temp_dir.child("requirements.txt");